How the Auto Cool controllers operate:

The sensor is measuring the OUTFLOW temperature of your radiator

and then sets the fan RPM to regulate the OUTFLOW temperature you have dialed with the black knob. So if you have set the OUTFLOW temperature 10 to 20 degrees F. below your thermostat temperature you will have rock solid engine temperature. Use a laser temperature gun at the OUTFLOW to

check your regulation. Check it parked and motor at an idle.

Also keep in mind, that three things are going to effect the fan RPM.

First is your speed, second is motor loading, and outside air temperature.

Starting your engine for the first time you will NOT see the fans start.

I do not want to hear the BS term "KICKING ON." When the radiator has reached about 140 F, +/-, the fan or fans will start to turn slowly. The fan(s) will increase RPM and reach the point of regulation that you have set with the black knob. For A/C fan speed control, there is a small pot on the side of the controller that sets this fan speed. The radiator control will over ride this fan speed.

Brushless fans: If you have this type of fan, it will fibrate at low RPM unless your purchase our 7Khz HF-125 controller.

Our controllers have Soft Start that limits inrush current from starting a dc fan motor from a dead stop. This is what brand X controller boys fail to realize and why their controllers keep burning out. Auto Cool also has a cool down timer, so when you turn off the ignition, the fans will operate for under a minute.

YOU CAN REACH US VIA THE PHONE OR

EMAIL JUST ABOUT 7 DAYS A WEEK.

DARRYL THE AUTO COOL GUY

562-367-3225

If you return a controller for test or repair, please put your full information in the package with name, address, email and phone number! It really helps us getting it back to you fast!

The On Line Store Page 1 below. . . .

DIESEL RADIATOR TEMPERATURE CONTROL

I made this video of the DX-150 - how it works on the bench.

Steve installed the DX-150 in his vehicle and made this video during the process.

US ARMY ORDINANCE

Name: AUTO COOL III BLUE
Brand: Auto Cool Guy

295TH FROM HASTINGS & GRAND ISLAND, NEBASKA 10-68 TO 10-69

Hydroxychloroquine was taken daily for a full year in Chu Lie to Quan Tri City, South Vietnam and still healthy as a horse to this day!

We have been building the Auto Cool Controllers right here in the USA starting in 2011. We build what the customers wants.

The Auto Cool Guy supplies the Standard Brass Sensor with your controller. However, if you purchase a Brass Plug Sensor or one of the Copper Inline Sensors, we do not supply the Standard Brass Sensor as the default sensor with your order.

All shipments south of the USA border should go via UPS, FED-X OR DHL,

If you have any doubts about your in-country postal system, go with UPS.

We are having major delays in shipments out and getting parts due to the world wide covid problem.

The Auto Cool III is our hot seller that is rated at 125 amps.

It has Soft Start, Fail Safe, A/C fan speed control and a cool

down timer. Our Auto Cool III comes in black due to high

demand. This controller and all our products are covered with

a full year warranty.

AUTO COOL III BLUE

$225.00